Door knob structure



Sept. 21, 1937. M FRAPPlER 2,093,717

DOOR KNOB STRUCTURE Filed 7, 1956 W a A Hame W Patented Sept. 21, 1937 UNITED STATES PATENT OFFICE Application August 7,

1 Claim.

This invention appertains to new and useful improvements in door knob structures.

The principal object of the present invention is to provide a door knob structure wherein a knob can be firmly secured to its shaft in such a way that it cannot easily become disassociated, which frequently occurs, with the conventional types of door knob structures now on the market.

Other important objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawing:--

Figure 1 represents a side elevational view of the structure mostly in longitudinal section.

Figure 2 is an end elevational view of the integral knob and shaft structure with the detachable knob removed.

Figure 3 is a cross section on line 3-3 of Figure 1.

Figure 4 is an end elevational view of the entire structure.

Figure 5 is an inside elevational view of the knob shown in Figure 4.

Figure 6 is a fragmentary side elevational view of the retaining screw.

Figure 7 is a section on line 'I-'I of Figure 6.

Figure 8 is an edge elevational view of the spring washer.

Referring to the drawing wherein like numerals designate like parts, it can be seen that the numeral 5 represents the shaft which connects the knobs 6'I. The shaft 5 and the knob 6 are preferably integral and the knob 6 has the shoulder construction 8 which of course abuts one side of a door (not shown).

The knob 1 is provided with the shank formation 9 and the recess I0 therein. The shaft 5 is provided with notches II at one end and at longitudinal spaced intervals so that the fitter can gauge the length the shaft should be for different size doors and cut on these notches.

1936, Serial No. 94,857

The notched end of the shaft 5 is provided with a threaded bore I2 for receiving the elongated screw I3 which is provided with a head I4 which can seat in the countersink I5 of the knob I. It is preferable that a spring washer I6 be seated in a recess surrounding the screw I3 and engage into the circumferential groove I3a of the screw I3 so as to prevent the screw I3 from accidently unscrewing from the shaft 5.

To place this split washer I6 in place, the washer is spiralled into the recess I5 of the knob 'I. The opening in the washer is substantially smaller in diameter than the diameter of the screw I3. After the Washer IIi has been disposed in the recess I5, the screw I3 is forced through the recess I5 and washer I6, the washer expanding as the screw I3 is forced through the same. When the groove I311. of the screw I3 reaches the washer IS, the washer will contract or spring into the groove and thus the screw becomes swivelly connected to the knob.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having thus. described the invention what is claimed as new is:

A door knob construction comprising a body having a bore therethrough, a knob retaining screw for disposition in the bore, said knob having a recess therein surrounding the bore, a split washer disposed in the recess and having an opening therethrough substantially smaller in diameter than the diameter of the screw, said screw having a circumferential groove therein for receiving the inner edge portion of the washer.

ERA M. FRAPPIEiR. 

